<input checked="checked" />
<input checked="checked" />
<input />
<input />
<input checked="  True    " />
<input checked="  False    " />
<input checked="    value: True   " />
<input checked="    value: False   " />
<input checked="True True" />
<input checked="   False  True" />
<input />
<input checked="" />
<input checked="   " />
<input checked=" value True" />